Fixing days to next free slot

templates/queries-index-mysql.tpl.html,
templates/queries-index-sqlite.tpl.html: Enhanced the query that finds
    the next free slot (query_next_available_episode). Also made it
    compute the days to the slot from the current day. The query returns
    data for calling Date::Calc to compute the number of days, but this
    calculation is no longer necessary. Next release will remove this.

templates/content-index.tpl.html: The number of days to the next free
    slot is reported here. The original Date::Calc computation which did
    this is no longer needed and has been removed since the query
    (query_next_available_episode) does it.

templates/content-index.tpl.html

@@ -26,17 +26,15 @@
 <hr>
   <article>
     <header>
-        <h3>Welcome to HPR the Community Podcast</h3>
+        <h3>Welcome to HPR, the Community Podcast</h3>
     </header>
 	<!--% days_till_next_episode = 0 %-->
 	<!--% USE DBI(constants.driver, constants.user, constants.password) %-->
-	<!--% FOREACH next_available_episode_result IN DBI.query(query_next_available_episode)
+	<!--% FOREACH next_available_episode_result IN DBI.query(query_next_available_episode) %-->
-	%-->
+	<!--% days_till_next_episode = next_available_episode_result.delta_days %-->
-	<!--% USE date %-->
-	<!--% calc = date.calc %-->
-	<!--%  days_till_next_episode = calc.Delta_Days(date.format(date.now, '%Y'),date.format(date.now, '%m'),date.format(date.now, '%d'),next_available_episode_result.last_year,next_available_episode_result.last_month,next_available_episode_result.last_day) %-->
 	<!--% END %-->
 	<!--% USE date %-->
+	<!--% calc = date.calc %-->
 	<!--% delta = date.calc.N_Delta_YMD(2005,9,19, date.format(date.now, '%Y'),date.format(date.now, '%m'),date.format(date.now, '%d')) %-->
 	<p>We started producing shows as <a href="<!--% absolute_path(baseurl) %-->eps/index.html#twat_episodes"><em>Today with a Techie</em></a> on 2005-09-19, <!--% delta.0 %--> years, <!--% delta.1 %--> months, <!--% delta.2 %--> days ago. our shows are produced by <a href="<!--% absolute_path(baseurl) %-->correspondents/index.html">listeners</a> like you and can be on any <a href="<!--% absolute_path(baseurl) %-->eps/index.html">topic</a> that <strong>"are of interest to <a href="https://en.wikipedia.org/wiki/hacker_(hobbyist)">hackers</a>"</strong>. If you listen to HPR then please consider contributing one show a year. if you <a href="<!--% absolute_url(baseurl) %-->about.html#so_you_want_to_record_a_podcast">record</a> your show now it could be <a href="<!--% hub_baseurl %-->calendar.php">released</a> in <strong><!--% days_till_next_episode %--></strong> days.</p>
   </article>

templates/queries-index-mysql.tpl.html

@@ -1,17 +1,32 @@
 <!--% query_next_available_episode = '
-		WITH next_id AS (
+    WITH next_id AS (
-		    SELECT id, id + 1 AS \'id_next\', date as \'last_date\'
+	SELECT id, id + 1 AS id_next, date as last_date
-			FROM eps
+	    FROM eps
-			WHERE eps.date > NOW() 
+	    WHERE eps.date > NOW()
-		)
+    ),
-		SELECT 
+    free_slot AS (
-			MIN(next_id.id_next) AS \'next_id\', 
+	SELECT
-			DATE_FORMAT(DATE_ADD(MIN(last_date), INTERVAL 1 DAY), \'%Y\') AS \'last_year\',
+	    last_date AS prev_date,
-			DATE_FORMAT(DATE_ADD(MIN(last_date), INTERVAL 1 DAY), \'%d\') AS \'last_day\',
+	    CASE
-			DATE_FORMAT(DATE_ADD(MIN(last_date), INTERVAL 1 DAY), \'%m\') AS \'last_month\'
+		WHEN DAYOFWEEK(last_date) = 6
-		FROM next_id
+		    THEN 3
-		LEFT JOIN eps ON next_id.id_next = eps.id 
+		ELSE 1
-		WHERE eps.id IS NULL
+	    END AS date_offset,
+	    next_id.id_next AS empty_slot
+	FROM next_id
+	LEFT JOIN eps ON next_id.id_next = eps.id
+	WHERE eps.id IS NULL
+	ORDER BY next_id.id
+	LIMIT 1
+    )
+    SELECT
+	empty_slot AS next_id,
+	ADDDATE(prev_date,date_offset) AS next_date,
+	YEAR(ADDDATE(prev_date,date_offset)) AS last_year,
+	MONTH(ADDDATE(prev_date,date_offset)) AS last_month,
+	DAY(ADDDATE(prev_date,date_offset)) AS last_day,
+	DATEDIFF(ADDDATE(prev_date,date_offset),NOW()) AS delta_days
+    FROM free_slot
 '
 %-->
 <!--% query_latest_episodes = '

templates/queries-index-sqlite.tpl.html

@@ -1,17 +1,32 @@
 <!--% query_next_available_episode = '
-		WITH next_id AS (
+    WITH next_id AS (
-		    SELECT id, id + 1 AS \'id_next\', date as \'last_date\'
+	SELECT id, id + 1 AS id_next, date as last_date
-			FROM eps
+	FROM eps
-			WHERE eps.date > date(\'now\')
+	WHERE eps.date > date(\'now\')
-		)
+    ),
-		SELECT 
+    free_slot AS (
-			MIN(next_id.id_next) AS \'next_id\', 
+	SELECT
-			strftime(\'%Y\', DATE (MIN (last_date), \'+1 Days\')) AS \'last_year\',
+	    last_date AS prev_date,
-			strftime(\'%d\', DATE (MIN (last_date), \'+1 Days\')) AS \'last_day\',
+	    CASE
-			strftime(\'%m\', DATE (MIN (last_date), \'+1 Days\')) AS \'last_month\'
+		WHEN strftime(\'%w\',last_date) = \'5\'
-		FROM next_id
+		    THEN \'+3 days\'
-		LEFT JOIN eps ON next_id.id_next = eps.id 
+		ELSE \'+1 days\'
-		WHERE eps.id IS NULL
+	    END AS date_offset,
+	    next_id.id_next AS empty_slot
+	FROM next_id
+	LEFT JOIN eps ON next_id.id_next = eps.id
+	WHERE eps.id IS NULL
+	ORDER BY next_id.id
+	LIMIT 1
+    )
+    SELECT
+	empty_slot AS next_id,
+	DATE (prev_date, date_offset) AS next_date,
+	strftime(\'%Y\', DATE (prev_date, date_offset)) AS last_year,
+	strftime(\'%m\', DATE (prev_date, date_offset)) AS last_month,
+	strftime(\'%d\', DATE (prev_date, date_offset)) AS last_day,
+	printf(\'%i\',abs(julianday(DATE (prev_date, date_offset)) - julianday(\'now\') + 1)) AS delta_days
+    FROM free_slot
 '
 %-->
 <!--% query_latest_episodes = '